Vol 14, No 3 (2016)

Articles

APPLICATION OF MINIMALLY REDUNDANT MODULAR ARITHMETIC TO PERFORM THE CRYPTOGRAPHIC TRANSFORMATIONS IN RSA-SYSTEM

Kolyada A.A., Kuchynski P.V., Chervyakov N.I.

Abstract

The article presents the methodological and algorithmic means of implementation of cryptographic RSA-transformations with the usage of minimally redundant modular arithmetic. Proposed solution contains redundant modular arithmetic algorithm of multiplication with squaring for exponentiation on a modular of cryptosystem and synthesis algorithm for evaluation of denormalization coefficient of computing scheme for this operation. Described exponentiation algorithm is based on optimized multiplicative minimally redundant modular arithmetic procedure of Montgomery multi-plication. Cryptographic transformation realized by proposed solution takes about 0.56…5.67 seconds for modules with digital capacity 1024…2048 bits under PC with processor Intel Core i5 (2,27 HHz). We developed new multiplicative-substractive method for denormalization coefficient calculation and fast and simple algorithm that takes nor more 13.3 minutes by conventional PC.
Infokommunikacionnye tehnologii. 2016;14(3):220-229
pages 220-229 views

SUBJECTIVE FACTORS OF STATISTICAL ANTENNA THEORY: ANALYSIS AND SIMULATION

Maslov O.N., Shatalov I.S.

Abstract

This work deals with problems of convergence between classical (objective) probability theory, subjective probability theory, learning theory and random antenna theory to research random antennas by statistical simulating methods. We demonstrate that statistical simulation initial data determination depends on data type: verified knowledge and subjective axiological knowledge (suppositions concerned with random antennas, characteristics and parameters of random antenna models). Problem of initial data representation (statistical data, experimental data) is one of the main statistic simulation method disadvantage, which may be solved by Monte-Carlo method. Database population by random antenna verified data helps to reduce knowledge uncertainty and to improve statistic simulation efficiency. We considered perspectives of statistic simulating model applications for developing active protection systems for data leakage to outside environment via random antennas.
Infokommunikacionnye tehnologii. 2016;14(3):229-237
pages 229-237 views

DESIGN OF GRADED REFRACTIVE INDEX PROFILE FOR SILICA OPTICAL FIBERS WITH CORE DIAMETER 42 MM AND REDUCED DIFFERENTIAL MODE DELAY

Andreev V.A., Bourdine A.V., Burdin V.A., Dmitriev E.V., Evtushenko A., Sevruk N.L., Khalikov R.K.

Abstract

We present method for design of refractive index profile for silica GeO2-doped graded-index few-mode optical fibers with reduced differential mode delay and suppressed mode nonlinearity due to enhanced core diameter up to 42 mm. Proposed solution is based on combination of well-known overlap integral method and earlier on developed modified Gaussian approximation generalized for analysis of silica weakly guiding optical fibers with single solid outer cladding and arbitrary axially-symmetric refractive index profile. This approach provides ability to derive analytical expressions for guided mode delays. Therefore, the objective function is represented as a sum of squares of deviations between mode staff delays and reference value corresponding to refractive index profile of current iteration. Based on developed method we performed computation for various combination of the reference mode delay and first iteration profile parameter. Some results of desired graded-index profile for a few-mode optical fibers 42/125 providing differential mode delay less then 50 ps/km over central region of "C"-range are represented.
Infokommunikacionnye tehnologii. 2016;14(3):238-247
pages 238-247 views

COMPUTING OF PARAMETERS FOR SCHEME OF MDM CHANNEL PRECISION POSITIONING AT THE FEW-MODE OPTICAL FIBER END

Bourdine A.V.

Abstract

This work presents method for computing of parameters for scheme of mode-division multiplexing (MDM) channel precision positioning at the excited few-mode optical fiber end. Proposed solution is based on combination of well-known overlap integral method and earlier on developed modified Gaussian approximation generalized for analysis of silica weakly guiding optical fibers with single solid outer cladding and arbitrary axially-symmetric refractive index profile. This approach provides ability to derive analytical expressions for arbitrary order mode coupling coefficients under particular radial misalignment. Based on developed method launching parameters were computed for 5 modes of MDM channels at the end of few-mode optical fiber (FMF) with core diameter 42 mm and reduced differential mode delay (DMD). According to obtained results, particular combination of MDM channel launched mode field radius and precision offset provides transmission of the almost launched mode power to only one excited FMF mode with the same azimuthal order. Some practical guidelines were developed to select positioning scheme parameters for MDM channel modes placement at the end of FMF 42/125 with low DMD.
Infokommunikacionnye tehnologii. 2016;14(3):247-258
pages 247-258 views

TELECOMMUNICATION COMPANY BIG DATA CLASSIFICATION BY DATA MINING TECHNIQUE

Samarkin M.E., Tarasov V.N.

Abstract

This work deals with analysis of telecommunication company customer information by data mining technique. For this purpose, we used cluster analysis method of k-means and support vector machines. The first was applied with non-conventional k-means++ centroid initialization method. Special software on C# language was developed that transforms initial data of telecommunication company to comma-separated values. We designed software on Python language with library sklearn for data clasterization. Data processing was performed, and customers with “aberrant behavior” were detected. Telecommunication company should make decision for those customers by itself. We developed classifier learned on big data based on support vector machines to classify new data of company.
Infokommunikacionnye tehnologii. 2016;14(3):258-263
pages 258-263 views

MODIFIED BELLMAN-FORD ALGORITHM WITH FORMING THE SHORTEST AND FALLBACK PATHS AND ITS APPLICATION FOR TELECOMMUNICATION NETWORK STABILITY IMPROVEMENT

Makarenko S.I., Kvasov M.N.

Abstract

Telecommunication system traffic is transmitted over the shortest path defined by routing protocols. In the case of channel failure or network node breakdown traffic should be quickly rerouted. However, the most known routing protocols are based on greedy algorithms for determination of the shortest paths (Dijkstra or Bellman-Ford algorithms). Therefore, result of mentioned algorithms application is a tree-type topology of overlay network for telecommunication system traffic transmission. In the case of failure this tree-type topology loses connection, and re-performing of algorithm for the shortest path determination is required that increases telecommunication system recovery time and reduces its stability. We propose to set a concurrent task for determination of fallback and redundant path for routing protocol shortest path determination algorithm that would be used under network element failure case that would improve network stability. This work presents solution for of the shortest path determination Bellman-Ford problem that is basic for routing protocols RIP, BGP, EBGP, IBGP, IGRP, EIGRP. Modified Bellman-Ford algorithm for fallback path forming utilizes data of node edges. It provides total telecommunication system improvement to values in proportion to network connectivity and topological complexity by preliminary forming of network fallback paths and rapid transitions to fallback channels without time spending for new paths searching.
Infokommunikacionnye tehnologii. 2016;14(3):264-274
pages 264-274 views

INTERVAL METHOD FOR DELAY EVALUATION IN ONE-BOX QUEUE SYSTEMS WITH GENERAL TYPE DEMAND STREAMS

Likhttsinder B.Y.

Abstract

This work concerns with analysis of time delays in queue systems with general type demand streams. Traffic of packet flows in multiservice networks is characterized by high correlation score. Based on proposed interval methods, we derived expressions that generalize Khinchin-Polaczek formula for average delay in queue systems with general type demand streams. Here the main analyzed parameters are time intervals between adjacent demands. We show that average queue size and average delays in queues are independent on which way they were been obtained - based on analysis of incoming demand intensity or as a result of adjacent demand time interval analysis. Some results of comparisons between computed data and real video traffic are represented.
Infokommunikacionnye tehnologii. 2016;14(3):274-278
pages 274-278 views

EVALUATION OF RELIABILITY OF ENTERPRISE CONTENT MANAGE-MENT SYSTEM DIRECTUM BY ANALYSIS OF OPERATION RESULTS

Mostovoi J.A., Burzueva N.N.

Abstract

Modern reliability theory widely uses quantitative indicators. Those indicators together with other efficiency indexes are applied during system design processes. They provide to choose optimal or compromise design solutions under taking into account their reliability. During software development that defines system concept level a number of methods for its verification are used. These methods are focused on reliability improvement. However on practice, estimation of achieved reliability is not performed. This work is concerned with estimation of software reliability indicators by analysis of results of appeared error statistical processing for enterprise content management system Directum updated according to customer requirements. We propose two complementary models of error appearing: discrete and continues under computing of Jelinski-Moranda parameters by the least square method. Reliability indicators been achieved because of Directum system debugging were evaluated and may be refined during its operation. Presented results provide prediction of Directum system reliability indicator variations.
Infokommunikacionnye tehnologii. 2016;14(3):279-285
pages 279-285 views

NEURAL NETWORK ANALYSIS OF DYNAMICALLY NONEQUILIBRIUM SITUATIONS OF ECONOMY SECTORS INTERACTION BY USING SIMULATING MODEL

Dimov E.M., Ilyasov B.G., Makarova E.A., Eftonova T.A.

Abstract

We propose hierarchical structure for economy sectors interaction management system as a part of multisector macroeconomic system. This structure contains three management levels. We used principles of feedback, adaptation and situation management. Developed structure differs by utilization of simulating models for scenario experiments, and application of neural networks and production models for solution the weakly formalized problems of multi-path analysis for dynamically nonequilibrium situations. We propose procedure for design of intelligent algorithms of economy sector interaction process situation management. The procedure provides multi-stage clustering of dynamically nonequilibrium situations, which is based on Kohonen neural networks. Neural net clustering of situations implies coherent decomposition of situations set over several classification criterions differing by selected levels of economy sector interaction process analysis. We developed Kohonen neural networks for multi-stage clustering of situations and designed self-organizing maps for clusters of dynamically nonequilibrium situations.
Infokommunikacionnye tehnologii. 2016;14(3):285-300
pages 285-300 views

DESIGN OF WAVELET-FUZZY CONTROLLER OF VECTOR CONTROL SYSTEM FOR INDUCTION MOTOR

Chervyakov N.I., Koldaev A.I.

Abstract

This work presents wavelet-fuzzy based controller for vector control of three-phase induction motor. We apply discrete wavelet transformation to decompose the error of motor speed mismatching over various frequency components. Transformed error coefficients together with scaling parameters are utilized for generating of motor control signal. Proposed controller satisfies to problem of speed regulation into closed looped control system. We performed researches the scheme of vector control with wavelet-fuzzy controller under various dynamic operation conditions. Results of comparison between operation of conventioanal proportional integral controller and developed wavelet-fuzzy controller are presented. Simulation results demonstrate efficiency of proposed wavelet-fuzzy controller.
Infokommunikacionnye tehnologii. 2016;14(3):300-307
pages 300-307 views

ANALYSIS OF METHODS FOR REGIONAL SFN BROADCASTING SERVICEABILITY ASSURANCE

Karyakin V.L., Karyakin D.V., Morozova L.A.

Abstract

SFN serviceability depends on synchronization availability between transmitters. In this paper we performed analysis of SFN network algorithms, and it shows the probability of loss synchronization between transmitters rises strongly without time delay calibration between network signal and transmitter modulator, that leads to SFN outages. Regional SFN serviceability under transmitter synchronization depends on gain margin defining by BER threshold. Nowadays guard band inconsistency is the main issue limiting effective application of SFN in Russia due to the same setting of this parameter for all regions by Federal Center of Multiplexing Formation. SFN serviceability should be provided by correction of emission time delay in transmitters. Therefore, all echo signals should be set inside of guard band due to emission time delay correction over broadcasting area. This work is concerned with possible options for regional SNF broadcasting serviceability. We analyzed advantages and disadvantages of Sweden program «Plan PROGIRA®», which is based on additional emission time delay correction in transmitters.
Infokommunikacionnye tehnologii. 2016;14(3):307-313
pages 307-313 views

EXPERIMENTAL RESEARCH OF INTRA-CORPORATE NETWORK RADIO-MOBILE SEGMENT BASED ON RADIO-OVER-FIBER TECHNIQUE

Naryshkin M.I.

Abstract

This work proposes solution for intra-corporate network radio-mobile segment realization based on Radio-over Fiber (RoF) technique. Results of developed prototype experimental researches are represented. Here radio-mobile network 300 MHz band was used. Yagi-Uda antennas with power gain 11 dB were used for base station (BS) and remote antenna units (RAU). Experimental tests were performed over typical urban area. Central station (CS) as well as BS were situated in industrial building, whide RAU was placed in office building over 400 m distance from BS. Antenna suspension heights were set therefore line-of-sight was block by adjacent buildings and constructions. There was various operating manufactory and industrial equipment near BS that causes strong distortions over radiofrequency band. Electric transport aerial contact wire lines installed near RAU were additional distortion source. This work presents results of experimental measurements that contained channel quality estimation by two telephone sets been connected to CS and RAU, BER measurements during modem connection performed by conventional utility Hyper Terminal, time delay and packet loss measurements under remote connection according to method RFC-2544.
Infokommunikacionnye tehnologii. 2016;14(3):313-318
pages 313-318 views

POLARIZATION CHARACTERISTICS OF THREE-APERTURE RANDOM ANTENNA RADIATION

Averianova A.N., Maslov O.N., Rakov A.S.

Abstract

This work presents results of researches of aperture random antenna (ARA) field intensity polarization characteristics performed by statistical simulation. ARA electromagnetic field structure should be analyzed for inspection the information about channel leakage from office to outer space. The article deals with a lattice consisting of three rectangular ARAs that simulate office windows that make information leakage. We performed researches of described construction electromagnetic field polarization characteristics by statistical simulations. The main results are represented in the form of histograms of azimuthal and meridional angles random values that demonstrate stochastic polarization of ARA field vectors with provided configuration.
Infokommunikacionnye tehnologii. 2016;14(3):319-328
pages 319-328 views

INNOVATIVE DEVELOPMENT OF THE UNIVERSITY. INTERSUBJECTIVE EDUCATION MANAGEMENT IN THE TECHNICAL UNIVERSITY

Moiseeva T.V.

Abstract

The study of the University innovative development problem showed the need to study two areas: the University management as socio-economic process and education management as teachers - student’s interaction process. Due to the fact that there is no clear understanding of what it means, and what forms of University management and innovative training are possible (except traditional), innovative development of universities is decelerated. Our time is the time of the post-non-classical scientific rationality entering, which is focused on subjective versus objective approach. The principles of the "ideal" bureaucracy that have been successful 100 years ago do not work. Therefore, the paper proposes a new approach to education management based on the theory of intersubjective management, which will help to grow “culture person”.
Infokommunikacionnye tehnologii. 2016;14(3):328-336
pages 328-336 views

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